How Do You Calculate Building Height Using Free Fall Formulas with Given Times?

[PhunPhysicsss]

Homework Statement

Figure out the height of the building using free fall formulas and only knowing two times: 3.25 second acceleration, 1.25 seconds decceleration. Find the height.

Homework Equations

Dy=V0t + 1/2at2 (only one I can think of that applies)

The Attempt at a Solution

Dy=V0t + 1/2at2
V0t=0

Dy= 1/2at2

Dy= .5(9.8m/s2)(10.5625)

Dy= 51.8 m

I am really stumped on this for some reason! I'm not even sure if I am using the correct formula. Any and all help is appreciated! Thanks y'all!

 

[tiny-tim]

Welcome to PF!

Hi PhunPhysicsss! Welcome to PF!

Figure out the height of the building using free fall formulas and only knowing two times: 3.25 second acceleration, 1.25 seconds decceleration. Find the height.

Sorry, I've no idea what you mean.

What's the full question? ​